header h1 {
  width: 100%;
  height: 1.25rem;
  line-height: 1.25rem;
  text-align: center;
  background: #1e1d1b;
  color: #fff;
  font-weight: normal;
  font-size: 14px;
}
[data-dpr="2"] header h1 {
  font-size: 28px;
}
[data-dpr="3"] header h1 {
  font-size: 42px;
}
header h1 #pre {
  display: inline-block;
  float: left;
  width: 1.25rem;
  height: 1.25rem;
  background: url("../img/xiao.png") no-repeat center center;
  background-size: 0.625rem 0.625rem;
}
header h1 #next {
  display: inline-block;
  float: right;
  width: 1.25rem;
  height: 1.25rem;
  background: url("../img/da.png") no-repeat center center;
  background-size: 0.625rem 0.625rem;
}
header h1 a {
  display: inline-block;
  width: 100%;
  height: 100%;
}
